--- /dev/null
+/*
+ * LZMA compressed kernel decompressor for bcm947xx boards
+ *
+ * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *
+ * Please note, this was code based on the bunzip2 decompressor code
+ * by Manuel Novoa III (mjn3@codepoet.org), although the only thing left
+ * is an idea and part of original vendor code
+ *
+ *
+ * 12-Mar-2005 Mineharu Takahara <mtakahar@yahoo.com>
+ * pass actual output size to decoder (stream mode
+ * compressed input is not a requirement anymore)
+ *
+ * 24-Apr-2005 Oleg I. Vdovikin
+ * reordered functions using lds script, removed forward decl
+ *
+ */
+
+#include "LzmaDecode.h"
+
+#define BCM4710_FLASH 0x1fc00000 /* Flash */
+
+#define KSEG0 0x80000000
+#define KSEG1 0xa0000000
+
+#define KSEG1ADDR(a) ((((unsigned)(a)) & 0x1fffffffU) | KSEG1)
+
+#define Index_Invalidate_I 0x00
+#define Index_Writeback_Inv_D 0x01
+
+#define cache_unroll(base,op) \
+ __asm__ __volatile__( \
+ ".set noreorder;\n" \
+ ".set mips3;\n" \
+ "cache %1, (%0);\n" \
+ ".set mips0;\n" \
+ ".set reorder\n" \
+ : \
+ : "r" (base), \
+ "i" (op));
+
+static __inline__ void blast_icache(unsigned long size, unsigned long lsize)
+{
+ unsigned long start = KSEG0;
+ unsigned long end = (start + size);
+
+ while(start < end) {
+ cache_unroll(start,Index_Invalidate_I);
+ start += lsize;
+ }
+}
+
+static __inline__ void blast_dcache(unsigned long size, unsigned long lsize)
+{
+ unsigned long start = KSEG0;
+ unsigned long end = (start + size);
+
+ while(start < end) {
+ cache_unroll(start,Index_Writeback_Inv_D);
+ start += lsize;
+ }
+}
+
+#define TRX_MAGIC 0x30524448 /* "HDR0" */
+
+struct trx_header {
+ unsigned int magic; /* "HDR0" */
+ unsigned int len; /* Length of file including header */
+ unsigned int crc32; /* 32-bit CRC from flag_version to end of file */
+ unsigned int flag_version; /* 0:15 flags, 16:31 version */
+ unsigned int offsets[3]; /* Offsets of partitions from start of header */
+};
+
+/* beyound the image end, size not known in advance */
+extern unsigned char workspace[];
+
+unsigned int offset;
+unsigned char *data;
+
+/* flash access should be aligned, so wrapper is used */
+/* read byte from the flash, all accesses are 32-bit aligned */
+static int read_byte(void *object, unsigned char **buffer, UInt32 *bufferSize)
+{
+ static unsigned int val;
+
+ if (((unsigned int)offset % 4) == 0) {
+ val = *(unsigned int *)data;
+ data += 4;
+ }
+
+ *bufferSize = 1;
+ *buffer = ((unsigned char *)&val) + (offset++ & 3);
+
+ return LZMA_RESULT_OK;
+}
+
+static __inline__ unsigned char get_byte(void)
+{
+ unsigned char *buffer;
+ UInt32 fake;
+
+ return read_byte(0, &buffer, &fake), *buffer;
+}
+
+/* should be the first function */
+void entry(unsigned long icache_size, unsigned long icache_lsize,
+ unsigned long dcache_size, unsigned long dcache_lsize)
+{
+ unsigned int i; /* temp value */
+ unsigned int lc; /* literal context bits */
+ unsigned int lp; /* literal pos state bits */
+ unsigned int pb; /* pos state bits */
+ unsigned int osize; /* uncompressed size */
+
+ ILzmaInCallback callback;
+ callback.Read = read_byte;
+
+ /* look for trx header, 32-bit data access */
+ for (data = ((unsigned char *) KSEG1ADDR(BCM4710_FLASH));
+ ((struct trx_header *)data)->magic != TRX_MAGIC; data += 65536);
+
+ /* compressed kernel is in the partition 0 or 1 */
+ if (((struct trx_header *)data)->offsets[1] > 65536)
+ data += ((struct trx_header *)data)->offsets[0];
+ else
+ data += ((struct trx_header *)data)->offsets[1];
+
+ offset = 0;
+
+ /* lzma args */
+ i = get_byte();
+ lc = i % 9, i = i / 9;
+ lp = i % 5, pb = i / 5;
+
+ /* skip rest of the LZMA coder property */
+ for (i = 0; i < 4; i++)
+ get_byte();
+
+ /* read the lower half of uncompressed size in the header */
+ osize = ((unsigned int)get_byte()) +
+ ((unsigned int)get_byte() << 8) +
+ ((unsigned int)get_byte() << 16) +
+ ((unsigned int)get_byte() << 24);
+
+ /* skip rest of the header (upper half of uncompressed size) */
+ for (i = 0; i < 4; i++)
+ get_byte();
+
+ /* decompress kernel */
+ if (LzmaDecode(workspace, ~0, lc, lp, pb, &callback,
+ (unsigned char*)LOADADDR, osize, &i) == LZMA_RESULT_OK)
+ {
+ blast_dcache(dcache_size, dcache_lsize);
+ blast_icache(icache_size, icache_lsize);
+
+ /* Jump to load address */
+ ((void (*)(void)) LOADADDR)();
+ }
+}
projects / openwrt.git / blobdiff